Magnetically guided positive-displacement machine

Abstract

A positive-displacement machine comprising a piston situated in a casing. The outline of the piston is hypertrochoidal, as is the outline of the hollow inside volume of the casing. The piston has n axes of symmetry, and the casing has n+1 axes of symmetry. The piston rotates inside the casing in orbital motion about the axis Δc of the casing. To obtain the rotation in orbital motion, firstly the piston is freely rotatably mounted on a crank pin that has its axis offset relative to the axis of a supporting shaft that is coaxial with the axis Δc of the casing, the shaft being rotated, and secondly the surface of the piston and the surface of the hollow inside volume of the casing are equipped with permanent magnets creating magnetic repulsion forces.

We claim: 
     
       1. A positive-displacement machine comprising a cylindrical piston which has an axis Δp, which is rotary, and which is situated in a cylindrical casing which has an axis Δc, wherein, in a plane perpendicular to its axis Δp, said piston has a cross-section that is hypertrochoidal in geometrical shape and that has S p  axes of symmetry, said casing delimiting a hollow volume whose cross-section in a plane perpendicular to its axis Δc is hypertrochoidal in geometrical shape and has S c  axes of symmetry, S p  and S c  differing from each other by unity, the axes Δp and Δc being parallel and separated by a distance E, said piston being mounted to rotate freely about its axis Δp, on a crank pin that has an axis Δp, and that is secured to a shaft having an axis Δc and supported by said casing, said shaft being designed to be rotated about its axis Δc by drive means, the piston and the casing delimiting at least three chambers between them, and the casing including at least one suction inlet and one delivery outlet, and wherein the rotation of the piston in its orbital motion about the axis Δc of the casing is created by magnetic repulsion forces by means of permanent magnets situated firstly on the surface of the piston, and secondly on the inside surface of said casing. 
     
     
       2. A positive-displacement machine according to claim 1, wherein said permanent magnets are axially polarized. 
     
     
       3. A positive-displacement machine according to claim 1, wherein said permanent magnets are radially polarized. 
     
     
       4. A positive-displacement machine according to claim 1, wherein said permanent magnets comprise a plurality of magnets on the surface of the piston and a plurality of magnets on the inside surface of the casing. 
     
     
       5. A positive-displacement machine according to claim 1, wherein said permanent magnets comprise magnetic bands carried by said piston and said casing. 
     
     
       6. A positive-displacement machine comprising a cylindrical piston which has an axis Δp, and which is situated in a cylindrical casing which has an axis Δc, wherein, in a plane perpendicular to its axis Δp, said piston has a cross-section that is hypertrochoidal in geometrical shape and that has S p  axes of symmetry, said casing delimiting a hollow volume whose cross-section in a plane perpendicular to its axis Δc is hypertrochoidal in geometrical shape and has S c  axes of symmetry, S p  and S c  differing from each other by unity, the axes Δp and Δc being parallel and separated by a distance E, and wherein said casing is mounted to rotate freely about its axis Δc, on a crank pin that has an axis Δc, and that is secured to a shaft having an axis Δp and supported by bearings in a box enclosing said casing, said box having a circularly cylindrical recess that has an axis Δp and that is large enough to enable the crank pin to rotate freely about the axis Δp of said shaft and to enable said casing to rotate in orbital motion about the axis Δp, said casing being open over a side face, and said piston being coupled to said box at said side face with no freedom of movement, said shaft being designed to be rotated about its axis Δp by drive means, the rotation of the casing in its orbital motion about the axis Δp of the piston being created by magnetic repulsion forces by means of permanent magnets situated firstly on the surface of the piston, and secondly on or in the vicinity of the inside surface of said casing, the piston and the casing delimiting at least three chambers between them, a side face of said box including at least one suction inlet and one delivery outlet communicating with each other in at least one of said chambers. 
     
     
       7. A positive-displacement machine according to claim 6, wherein said permanent magnets are axially polarized. 
     
     
       8. A positive-displacement machine according to claim 6, wherein said permanent magnets are radially polarized. 
     
     
       9. A positive-displacement machine according to claim 2, wherein said permanent magnets comprise a plurality of magnets on the surface of the piston and a plurality of magnets on the inside surface of the casing. 
     
     
       10. A positive-displacement machine according to claim 2, wherein said permanent magnets comprise magnetic bands carried by said piston and said casing. 
     
     
       11. A positive-displacement machine comprising a cylindrical piston which has an axis Δp, which is rotary, and which is situated in a cylindrical casing which has an axis Δc, wherein, in a plane perpendicular to its axis Δp, said piston has a cross-section that is hypertrochoidal in geometrical shape and that has Sp axes of symmetry, said casing delimiting a hollow volume whose cross-section in a plane perpendicular to its axis Δc is hypertrochoidal in geometrical shape and has Sc axes of symmetry, Sp and Sc differing from each other by unity, the axes Δp and Δc being parallel and separated by a distance E, said piston being mounted to rotate freely about its axis Δp, on a crank pin that has an axis Δp, and that is secured to a shaft having an axis Δc and supported by said casing, said shaft being designed to be rotated about its axis Δc by drive means, the piston and the casing delimiting at least three chambers between them, and the casing including at least one suction inlet and one delivery outlet, and wherein the rotation of the piston in its orbital motion about the axis Δc of the casing is created by magnetic repulsion forces by means of permanent magnets situated firstly in a vicinity of the surface of the piston, and secondly in a vicinity of the inside surface of said casing. 
     
     
       12. A positive-displacement machine according to claim 11, wherein said permanent magnets are axially polarized. 
     
     
       13. A positive-displacement machine according to claim 11, wherein said permanent magnets are radially polarized. 
     
     
       14. A positive-displacement machine according to claim 11, wherein said permanent magnets comprise a plurality of magnets on the piston and a plurality of magnets on the casing. 
     
     
       15. A positive-displacement machine according to claim 11, wherein said permanent magnets comprise magnetic bands carried by said piston and said casing. 
     
     
       16. A positive-displacement machine comprising a cylindrical piston which has an axis Δp, and which is situated in a cylindrical casing which has an axis Δc, wherein, in a plane perpendicular to its axis Δp, said piston has a cross-section that is hypertrochoidal in geometrical shape and that has Sp axes of symmetry, said casing delimiting a hollow volume whose cross-section in a plane perpendicular to its axis Δc is hypertrochoidal in geometrical shape and has Sc axes of symmetry, Sp and Sc differing from each other by unity, the axes Δp and Δc being parallel and separated by a distance E, and wherein said casing is mounted to rotate freely about its axis Δc, on a crank pin that has an axis Δc, and that is secured to a shaft having an axis Δp and supported by bearings in a box enclosing said casing, said box having a circularly cylindrical recess that has an axis Δp and that is large enough to enable the crank pin to rotate freely about the axis Δp of said shaft and to enable said casing to rotate in orbital motion about the axis Δp, said casing being open over a side face, and said piston being coupled to said box at said side face with no freedom of movement, said shaft being designed to be rotated about its axis Δp by drive means, the rotation of the casing in its orbital motion about the axis Δp of the piston being created by magnetic repulsion forces by means of permanent magnets situated firstly in a vicinity of the surface of the piston, and secondly in the vicinity of the inside surface of said casing, the piston and the casing delimiting at least three chambers between them, a side face of said box including at least one suction inlet and one delivery outlet communicating with each other in at least one of said chambers. 
     
     
       17. A positive-displacement machine according to claim 16, wherein said permanent magnets are axially polarized. 
     
     
       18. A positive-displacement machine according to claim 16, wherein said permanent magnets are radially polarized. 
     
     
       19. A positive-displacement machine according to claim 16, wherein said permanent magnets comprise a plurality of magnets on the piston and a plurality of magnets on the casing. 
     
     
       20. A positive-displacement machine according to claim 16, wherein said permanent magnets comprise magnetic bands carried by said piston and said casing.